JP4018084B2 - Cell type filter cartridge and manufacturing method thereof - Google Patents

Description

  The present invention relates to a cell type filter cartridge, and more particularly to a cell type filter cartridge that prevents damage due to cell back pressure and a method for manufacturing the same.

  In a filter cartridge having a plurality of cells, the filtration fluid flows from the outside of the filter element (filter body) into the space between the layers of the filter elements toward the central portion of the cells for filtration. However, a reverse pressure (line back pressure) may be applied to the filter element through the filtration flow path during the filtration operation or during the backwash operation. This reverse pressure reduces the tensile stress of the filter element and masks (shields). ), Peeling of the brake, cracking of the edge seal, etc. are caused, which may cause damage to the filter cartridge.

  Therefore, in the conventional cell type filter cartridge, the outer surface of each cell is reinforced with a mesh member (net) to prevent the damage (Patent Document 1 and Patent Document 2).

  Here, as shown in FIG. 13, in the manufacture of the conventional cell type filter cartridge, first, a commercially available net roll is purchased, heat treatment for preventing shrinkage is performed, and a predetermined shape and dimensions are obtained by a die cutting die or the like. Die cutting. And after inserting the net (net-like member) that has been die-cut into the mold and aligning with other members, such as filter elements, separators, etc., the edges are molded and sealed by injection molding, They are integrated to form a cell type filter cartridge.

However, in such a conventional method for manufacturing a cell type filter cartridge, first, a commercially available net roll is purchased and used, but the net cost is high (occupies about 16% of the total material cost) to prevent shrinkage. The net roll is required to be heat-treated, and the net roll is die-cut into a predetermined shape and size, so that net scrap waste is generated. Furthermore, it is necessary to insert a die-cut net into the mold and align it with other members, but this alignment is difficult and sufficient back pressure resistance is required unless accurate alignment is performed. There is a problem that the performance cannot be exhibited and the productivity of the filter cartridge as a whole is greatly reduced.
Japanese Patent No. 3,020,507 US Pat. No. 5,055,192

  The problem to be solved by the present invention is that, in the cell type filter cartridge used for fluid filtration, the material cost required for cutting the net from the net roll is high, and the alignment of the net and other members at the time of manufacture thereof This is a decrease in yield and back pressure resistance due to the difficulty and inaccurate alignment.

  The present invention relates to a first filter element and a second filter element each having an outer surface and an inner surface and having a filtration flow path from the outer surface to the inner surface, and a cell formed between the first and second filter elements. And a separator stored in the cell, wherein the filter element is reinforced by stretching a mesh member formed in advance on the outer surfaces of the first and second filter elements. About.

  In the cell type filter cartridge of the present invention, the inner diameter portion of the net to be attached to the filter element and the ring seal can be combined in advance before molding, so that positioning within the mold during molding becomes easy and production is possible. There is an advantage that the performance is greatly improved.

  As shown in FIG. 1 and FIG. 2 attached, the cell type filter cartridge 1 of the present invention comprises a cell assembly 2 with a net comprising compartments (cells) stacked vertically. Each cell assembly 2 with a net is arranged on the upper and lower outer surfaces of filter elements 20a and 20b as filter bodies, and in particular, a net 21 and a separator 6 accommodated in a cell 23 as shown in FIGS. The outer edges of the filter elements 20a and 20b are sealed and integrated by the edge mold 7. 2 and 4, the separator 6 includes a large number of radial ribs 6 a and a large number of ring-shaped supports 6 a that are concentrically attached to the ribs 6 a in the circumferential direction. A filter 23 is disposed in the cell 23 formed between the elements 20a and 20b to prevent the filter cell assembly 2 from being crushed, to provide safety to the individual filter cell assembly 2 and to flow through the cell 23. Minimize fluid resistance as much as possible.

  Further, on the center side of the filter elements 20a and 20b, a ring seal 8 described later is coupled to the engagement between the engagement notch 81 and the engagement pin 22 provided on the net 21, and the filter elements 20a and 20b are The ring seal 8 is engaged with and attached to the core 3 as shown in FIG. 4, and the upper end of the core 3 is sealed with a ring retaining gasket 4 and a flat gasket 5.

  A cell type filter cartridge 1 in which a plurality of cell assemblies 2 with nets are stacked is housed in the filter housing H shown in FIG. 1, and the fluid to be filtered is contained in the filter housing H as shown in FIG. As shown by the arrows in FIG. 4 through the unfiltered fluid inlet, the filter elements 20a and 20b pass through the filter regions on the upper and lower surfaces (both sides) of the filter elements 20a and 20b on which the net 21 is stretched. The filtered fluid enters the cell 23 and is rectified by the separator 6, and the filtered fluid flows into the core 3 which is the central opening of the filter cartridge 1 from the core opening 3a. From the outlet shown in FIG. It is supposed to be discharged.

  In particular, in the cell type filter cartridge 1 of the present invention, in order to facilitate accurate alignment of the net 21 with respect to the filter elements 20a and 20b, first, as shown in FIG. Part 25, a net rim 24 radially extending from the inner diameter part 25, and net spokes 23 having different diameters arranged concentrically in the radial direction, and FIG. As shown in FIG. 7, which is an enlarged view, two engagement pins 22 that engage with the ring seal 8 are erected in the vicinity of the inner diameter portion 25 of the net 21.

  The ring seal 8 engaged and integrated with the net 21 has a slightly larger outer diameter than the inner diameter portion 25 of the net 21, as shown in FIGS. As shown in the partial enlarged cross-sectional view, it consists of two convex portions 82 and 83 and an edge portion 80. Two engaging notches 81 that engage with the two engaging pins 22 projecting from the net 21 are formed on the edge 80 so as to face the engaging pins 22. Note that the positional relationship before engagement between the net 21 and the ring seal 8 is illustrated in FIG. 4 as described above.

  In order to manufacture the cell type filter cartridge 1 of the present invention having such a configuration, as shown in FIG. 12, first, the net 21 is separately injection-molded, and then the engaging pin 22 of the net 21 that has been injection-molded. Then, the notch for engagement of the ring seal 8 is engaged, and the net 21 and the ring seal 8 are integrated and assembled. Then, the integrated net 21 and the ring seal 8 are inserted into a mold, aligned with the filter elements 20a and 20b and set, and the edge mold 7 is formed on the outer edges of the filter elements 20a and 20b by injection molding. Is injection-molded and sealed. Then, unnecessary portions are removed to form a cell assembly 2 with a net, a predetermined number of the cell assemblies 2 with a net are stacked on the outer periphery of the core 3, and a ring retaining gasket 4 is formed on the upper end of the core 3. The flat gasket 5 is installed and sealed, and the pressure resistance test is performed to obtain the cell type filter cartridge 1. In use, the seal plate 5 b is fixed to the upper end of the core 3.

  Thus, by configuring the cell type filter cartridge of the present invention, the cost of the net, which accounts for about 16% of the material cost of the filter cartridge, can be reduced by about 30%, and the inner diameter portion of the net and the ring seal are connected to the edge mold. By combining in advance before injection molding, alignment during molding is facilitated, and net cutting work as in the prior art can be omitted. Furthermore, according to the present invention, the pressure resistance reliability of the conventional net is about 30%, but the pressure resistance reliability at a back pressure of 0.1 Mpa can be almost 100%, and in addition, the use of a filter cartridge The contact between cells at the time is prevented, and the effective filtration area can be maintained.

  The present invention can be applied not only to the alignment of the net and ring seal in the cell type filter cartridge but also to an application in which the attachment of the filter element and the ring seal is indispensable in a normal filter.

The partially broken front view of the cell type filter cartridge of this invention. It is a partially broken plan view of the cell type filter cartridge of the present invention, and shows a partial plan view of the separator by partially breaking with a partial plane of the net. The A section enlarged partial sectional view of the cell type filter cartridge shown in FIG. The B section expanded partial sectional view of FIG. The top view of the net | network used for the cell type filter cartridge of this invention. CC sectional view of the net | network shown in FIG. The D section enlarged view of the net | network shown in FIG. The top view of the ring seal used for the cell type filter cartridge of the present invention. EE arrow sectional drawing of the ring seal shown in FIG. The F section expanded sectional view of the ring seal shown in FIG. The perspective view before assembling the net | network and ring seal which are used for the cell type filter cartridge of this invention. Process drawing which shows the manufacturing method of the cell type filter cartridge of this invention. Process drawing which shows the manufacturing method of the conventional cell type filter cartridge.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cell type filter cartridge 2 Cell assembly with net 3 Core 4 Ring retaining gasket 5 Flat gasket 6 Separator 7 Edge mold 8 Ring seal 20a, 20b Filter element 21 Net (net-like member)
22 engaging pin 23 net spoke 24 net rim 80 edge 81 engaging notch 82 convex part 83 convex part

Claims (2)

A first filter element and a second filter element each having an outer surface and an inner surface, and each having a filtration flow path extending from the outer surface to the inner surface;
A cell that is a space formed between the two filter elements by connecting the first and second filter elements;
A separator stored in the cell to avoid collapse of the filter element;
A net-like member molded in advance into a planar shape to be stretched on the outer surfaces of the first and second filter elements;
A hole formed in the center of the mesh member;
A ring seal that is pre-formed in a ring shape and engages with the hole;
A notch provided in the outer edge of the ring seal;
An engagement pin provided on an inner edge of the mesh member, and a filter cell integrated by engaging the notch and the engagement pin;
A filter cartridge comprising a plurality of the filter cells stacked in the vertical direction. A first filter element and a second filter element having an outer surface and an inner surface and having a filtration flow path from the outer surface to the inner surface, and the first and second filter elements are connected to each other to form the filter element. The filter element includes a cell that is a space formed and a separator that is stored in the cell in order to avoid crushing, and a mesh member formed in advance is stretched on the outer surface of the first and second filter elements. A filter cartridge manufacturing method in which a plurality of filter cells each having a reinforced shape are vertically stacked, and is engaged with a ring seal previously formed into a ring shape in a hole provided in a mesh member, and an outer edge portion of the ring seal after integrally engage an engaging pin provided on the inner edge of the provided the notch and the net-like member, the first off is set in a mold Filter element and the alignment of the second filter element, a manufacturing method of a filter cartridge in which a plurality of stacked filter cell which is sealed by injection molding an edge mold to an outer edge of the filter element in a vertical direction.

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